问题
选择题
Be careful not to ______ your bike with so many heavy bags.
A．turn off
B．set off
C．take off
D．fall off
答案
答案：D
题目分析：句意：小心点。带这么沉重的袋子，别跌落了。turn off 关； set off 出发，动身；take off 脱下，起飞；fall off跌落。所以选D。
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